<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>sup 上标</title>
</head>
<body>

    <p>This text contains superscript</p>

    <p>This text contains <sup>superscript</sup></p>
    <p>This text contains <span style="vertical-align: super; font-size: small">superscript</span></p>

</body>
</html>